I don’t know about the trees not matching or the police officer, but there were never a lot of people in that stretch of fence. That stretch didn’t have a good view, as it was blocked by the north bleachers. The fence crowd was further west.
If you take a screen grab from the video at highest resolution (1080) and blow it up 400% you can make out the tripods of the guys. The man on the left (further from the front of the barn) is hunkered down and not raised much over the top, but is visible. The one on the right kind of blends in with the trees, but I think I see him.
